package thread;
//什么是

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 线程池
 */
public class ThreadPoolDemo {
    public static void main(String[] args) {
        //创建一个具有2条线程的线程池
        ExecutorService threadPool = Executors.newFixedThreadPool(3);
        for (int i = 0; i < 5; i++) {
            Runnable r = () -> {
                try {
                    Thread t = Thread.currentThread();
                    System.out.println(t.getName() + ":正在执行一个任务...");
                    Thread.sleep(5000);
                    System.out.println(t.getName() + ":任务执行完毕...");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            };
            threadPool.execute(r);
            System.out.println("将一个任务交给了线程池");
        }
//        线程池不再接受新任务，线程池内部任务执行完毕后结束
        threadPool.shutdown();
//
//        threadPool.shutdownNow();
        System.out.println("停止线程");
    }
}
